/* ============================================
   抖音风 - 原创样式表
   品牌：抖音风 | 域名：miatfw.cn
   配色：活力橙 #FF6B35 / 深夜蓝 #1A1A2E / 樱花红 #E94560
   ============================================ */

/* --- Reset & Base --- */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;background:#0F0F1A;color:#EAEAEA;line-height:1.7;overflow-x:hidden}
a{color:#FF6B35;text-decoration:none;transition:color .3s}
a:hover{color:#E94560}
img{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}

/* --- Container --- */
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* --- Header --- */
.site-header{background:linear-gradient(135deg,#1A1A2E 0%,#16213E 100%);position:sticky;top:0;z-index:1000;box-shadow:0 2px 20px rgba(0,0,0,.5)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto}
.logo-wrap{display:flex;align-items:center;gap:10px}
.logo-wrap img{height:48px;width:auto}
.logo-text{font-size:1.5rem;font-weight:800;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* --- Navigation --- */
.main-nav{display:flex;align-items:center;gap:0}
.main-nav a{padding:10px 14px;font-size:.9rem;color:#EAEAEA;position:relative;transition:all .3s}
.main-nav a::after{content:'';position:absolute;bottom:0;left:50%;width:0;height:2px;background:linear-gradient(90deg,#FF6B35,#E94560);transition:all .3s;transform:translateX(-50%)}
.main-nav a:hover::after,.main-nav a.active::after{width:70%}
.main-nav a:hover{color:#FF6B35}
.mobile-toggle{display:none;background:none;border:none;color:#EAEAEA;font-size:1.5rem;cursor:pointer}

/* --- Search Bar --- */
.search-bar{background:linear-gradient(90deg,#1A1A2E,#0F3460);padding:14px 0}
.search-wrap{max-width:600px;margin:0 auto;display:flex;gap:0;border-radius:30px;overflow:hidden;box-shadow:0 4px 15px rgba(255,107,53,.2)}
.search-wrap input{flex:1;padding:12px 24px;border:none;background:#16213E;color:#EAEAEA;font-size:.95rem;outline:none}
.search-wrap input::placeholder{color:#666}
.search-wrap button{padding:12px 28px;background:linear-gradient(135deg,#FF6B35,#E94560);color:#fff;border:none;font-size:.95rem;cursor:pointer;transition:opacity .3s;font-weight:600}
.search-wrap button:hover{opacity:.85}

/* --- Hero Banner --- */
.hero-section{position:relative;height:480px;overflow:hidden}
.hero-section img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(15,15,26,.3),rgba(15,15,26,.85));display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:20px}
.hero-overlay h1{font-size:2.8rem;margin-bottom:12px;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-overlay p{font-size:1.15rem;max-width:700px;color:#ccc}
.hero-tags{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap;justify-content:center}
.hero-tags span{padding:6px 16px;background:rgba(255,107,53,.15);border:1px solid rgba(255,107,53,.3);border-radius:20px;font-size:.85rem;color:#FF6B35}

/* --- Section Common --- */
.section{padding:60px 0}
.section-title{text-align:center;margin-bottom:40px}
.section-title h2{font-size:2rem;margin-bottom:8px;color:#EAEAEA}
.section-title h2 span{color:#FF6B35}
.section-title p{color:#888;font-size:1rem}
.section-alt{background:#12122A}

/* --- Video Card Grid --- */
.video-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.video-card{position:relative;border-radius:12px;overflow:hidden;background:#1A1A2E;transition:transform .3s,box-shadow .3s;cursor:pointer}
.video-card:hover{transform:translateY(-6px);box-shadow:0 12px 30px rgba(255,107,53,.2)}
.video-thumb{position:relative;aspect-ratio:16/9;overflow:hidden}
.video-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.video-card:hover .video-thumb img{transform:scale(1.08)}
.play-btn{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,.4);opacity:0;transition:opacity .3s}
.video-card:hover .play-btn{opacity:1}
.play-btn svg{width:56px;height:56px;fill:#FF6B35;filter:drop-shadow(0 2px 8px rgba(0,0,0,.5))}
.video-info{padding:14px}
.video-info h3{font-size:.95rem;margin-bottom:6px;color:#EAEAEA;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.video-meta{display:flex;gap:12px;font-size:.8rem;color:#888}
.video-meta span{display:flex;align-items:center;gap:4px}
.video-tag{display:inline-block;padding:2px 8px;background:rgba(255,107,53,.12);color:#FF6B35;border-radius:4px;font-size:.75rem;margin-top:6px}

/* --- Feature Cards --- */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:linear-gradient(145deg,#1A1A2E,#16213E);border-radius:16px;padding:30px;text-align:center;transition:transform .3s,box-shadow .3s;border:1px solid rgba(255,107,53,.08)}
.feature-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(233,69,96,.15)}
.feature-icon{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,#FF6B35,#E94560);border-radius:16px;display:flex;align-items:center;justify-content:center}
.feature-icon svg{width:32px;height:32px;fill:#fff}
.feature-card h3{font-size:1.1rem;margin-bottom:8px;color:#FF6B35}
.feature-card p{font-size:.9rem;color:#aaa}

/* --- Expert Section --- */
.expert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.expert-card{background:#1A1A2E;border-radius:16px;overflow:hidden;text-align:center;transition:transform .3s}
.expert-card:hover{transform:translateY(-4px)}
.expert-avatar{width:120px;height:120px;border-radius:50%;margin:24px auto 16px;overflow:hidden;border:3px solid #FF6B35}
.expert-avatar img{width:100%;height:100%;object-fit:cover}
.expert-card h3{font-size:1.05rem;color:#EAEAEA;margin-bottom:4px}
.expert-card .role{color:#FF6B35;font-size:.85rem;margin-bottom:10px}
.expert-card p{font-size:.85rem;color:#888;padding:0 20px;margin-bottom:16px}
.expert-btns{display:flex;gap:10px;justify-content:center;padding-bottom:24px}
.btn-sm{padding:8px 18px;border-radius:20px;font-size:.8rem;border:none;cursor:pointer;transition:all .3s}
.btn-primary{background:linear-gradient(135deg,#FF6B35,#E94560);color:#fff}
.btn-outline{background:transparent;border:1px solid #FF6B35;color:#FF6B35}
.btn-outline:hover{background:#FF6B35;color:#fff}

/* --- Partner Logos --- */
.partner-wall{display:flex;flex-wrap:wrap;justify-content:center;gap:30px;align-items:center}
.partner-wall .partner-item{width:140px;height:70px;background:#1A1A2E;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:.85rem;color:#888;border:1px solid rgba(255,107,53,.1);transition:all .3s}
.partner-wall .partner-item:hover{border-color:#FF6B35;color:#FF6B35}

/* --- FAQ Section --- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#1A1A2E;border-radius:12px;margin-bottom:12px;overflow:hidden;border:1px solid rgba(255,107,53,.08)}
.faq-q{padding:18px 24px;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#EAEAEA;transition:color .3s}
.faq-q:hover{color:#FF6B35}
.faq-q .arrow{transition:transform .3s;color:#FF6B35}
.faq-item.open .faq-q .arrow{transform:rotate(180deg)}
.faq-a{padding:0 24px;max-height:0;overflow:hidden;transition:all .4s ease;color:#aaa;font-size:.9rem}
.faq-item.open .faq-a{padding:0 24px 18px;max-height:500px}

/* --- Reviews --- */
.review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.review-card{background:#1A1A2E;border-radius:12px;padding:24px;border:1px solid rgba(255,107,53,.08)}
.review-card .stars{color:#FF6B35;margin-bottom:8px;font-size:1.1rem}
.review-card p{font-size:.9rem;color:#ccc;margin-bottom:12px;font-style:italic}
.review-card .reviewer{font-size:.85rem;color:#888}

/* --- Contact Section --- */
.contact-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px}
.contact-info{background:#1A1A2E;border-radius:16px;padding:30px}
.contact-info h3{color:#FF6B35;margin-bottom:16px;font-size:1.2rem}
.contact-item{display:flex;gap:12px;margin-bottom:14px;align-items:flex-start}
.contact-item .label{color:#888;min-width:80px;font-size:.9rem}
.contact-item .value{color:#EAEAEA;font-size:.9rem}

/* --- How-To Guide --- */
.howto-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:30px}
.howto-step{text-align:center;padding:24px;background:#1A1A2E;border-radius:12px;position:relative}
.step-num{width:40px;height:40px;background:linear-gradient(135deg,#FF6B35,#E94560);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-weight:700;font-size:1.1rem;color:#fff}
.howto-step h4{color:#EAEAEA;margin-bottom:6px;font-size:.95rem}
.howto-step p{color:#888;font-size:.85rem}

/* --- Social Share --- */
.share-bar{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.share-btn{display:flex;align-items:center;gap:6px;padding:10px 20px;border-radius:25px;font-size:.85rem;color:#fff;transition:opacity .3s;cursor:pointer;border:none}
.share-btn:hover{opacity:.8}
.share-wechat{background:#07C160}
.share-weibo{background:#E6162D}
.share-douyin{background:#161823}
.share-bilibili{background:#00A1D6}

/* --- Footer --- */
.site-footer{background:linear-gradient(135deg,#0A0A18,#1A1A2E);padding:50px 0 0;border-top:1px solid rgba(255,107,53,.1)}
.footer-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:24px;margin-bottom:40px}
.footer-col h4{color:#FF6B35;margin-bottom:16px;font-size:1rem}
.footer-col p,.footer-col a{font-size:.85rem;color:#888;display:block;margin-bottom:8px}
.footer-col a:hover{color:#FF6B35}
.footer-qr{display:flex;gap:20px}
.footer-qr .qr-item{text-align:center}
.footer-qr .qr-item img{width:120px;height:120px;border-radius:8px;margin-bottom:6px}
.footer-qr .qr-item span{font-size:.8rem;color:#888}
.footer-bottom{text-align:center;padding:20px 0;border-top:1px solid rgba(255,255,255,.05);font-size:.85rem;color:#666}
.footer-bottom span{color:#FF6B35}

/* --- Breadcrumb --- */
.breadcrumb{padding:14px 0;font-size:.85rem;color:#888}
.breadcrumb a{color:#FF6B35}
.breadcrumb span{margin:0 6px}

/* --- Inner Page --- */
.page-hero{height:300px;position:relative;overflow:hidden}
.page-hero img{width:100%;height:100%;object-fit:cover}
.page-hero-overlay{position:absolute;inset:0;background:linear-gradient(to bottom,rgba(15,15,26,.2),rgba(15,15,26,.9));display:flex;flex-direction:column;justify-content:flex-end;padding:40px}
.page-hero-overlay h1{font-size:2.2rem;color:#FF6B35}
.page-hero-overlay p{color:#ccc;margin-top:8px}
.page-content{padding:40px 0}
.page-content p{margin-bottom:16px;color:#ccc;font-size:.95rem}
.page-content h2{color:#FF6B35;margin:30px 0 16px;font-size:1.5rem}
.page-content h3{color:#EAEAEA;margin:20px 0 12px;font-size:1.2rem}

/* --- Community Module --- */
.community-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.community-card{background:linear-gradient(145deg,#1A1A2E,#16213E);border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(233,69,96,.1);transition:all .3s}
.community-card:hover{border-color:#E94560;transform:translateY(-3px)}
.community-card h3{color:#E94560;margin-bottom:8px}
.community-card p{color:#888;font-size:.9rem}

/* --- Responsive --- */
@media(max-width:1024px){
  .video-grid{grid-template-columns:repeat(3,1fr)}
  .feature-grid,.expert-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .howto-steps{grid-template-columns:repeat(2,1fr)}
  .honor-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .header-inner{flex-wrap:wrap}
  .main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}
  .main-nav.open{display:flex}
  .mobile-toggle{display:block}
  .hero-section{height:320px}
  .hero-overlay h1{font-size:1.8rem}
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid,.expert-grid,.community-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .search-wrap{border-radius:12px}
  .honor-grid{grid-template-columns:1fr}
  .trust-items{gap:20px}
  .trust-item strong{font-size:1.4rem}
}
@media(max-width:480px){
  .video-grid{grid-template-columns:1fr}
  .hero-overlay h1{font-size:1.4rem}
  .section{padding:40px 0}
}

/* --- Animations --- */
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.animate-in{animation:fadeInUp .6s ease forwards}

/* --- Trust Bar EEAT --- */
.trust-bar{padding:30px 0;background:linear-gradient(90deg,#0F3460,#1A1A2E)}
.trust-items{display:flex;justify-content:center;gap:50px;flex-wrap:wrap}
.trust-item{text-align:center}
.trust-item strong{display:block;font-size:1.8rem;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-weight:800}
.trust-item span{font-size:.85rem;color:#888}

/* --- Honor Grid EEAT-Authority --- */
.honor-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.honor-card{background:#1A1A2E;border-radius:12px;padding:24px;text-align:center;border:1px solid rgba(255,107,53,.08);transition:all .3s}
.honor-card:hover{border-color:#FF6B35;transform:translateY(-3px)}
.honor-card .honor-icon{font-size:2.5rem;margin-bottom:12px}
.honor-card h4{color:#FF6B35;margin-bottom:8px;font-size:1rem}
.honor-card p{color:#888;font-size:.85rem}

/* --- Expert Certifications --- */
.expert-certs{font-size:.8rem;color:#888;padding:0 20px 12px;border-top:1px solid rgba(255,107,53,.1);padding-top:10px;margin:0 20px}

/* --- Footer Brand with Logo --- */
.footer-brand .footer-logo{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.footer-brand .footer-logo img{width:40px;height:40px}
.footer-brand .footer-logo span{font-size:1.2rem;font-weight:700;background:linear-gradient(135deg,#FF6B35,#E94560);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.footer-brand .footer-desc{font-size:.85rem;color:#888;line-height:1.6}

/* --- Video Duration Badge --- */
.video-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem}

/* --- Lazy Load Placeholder --- */
.lazy-placeholder{background:linear-gradient(90deg,#1A1A2E 25%,#222244 50%,#1A1A2E 75%);background-size:200% 100%;animation:shimmer 1.5s infinite}
@keyframes shimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}